require "bunny"
require "json"
require "securerandom"

QUEUE = "appId:queue"
VHOST = 'shared'

def consume
  consumer_conn = Bunny.new(
    hostname: "us-east-1-a-queue.ably.io",
    username: 'app123.key',
    password: 'password',
    vhost:    VHOST
  )

  consumer_conn.start
  # Specifying durable is important as this needs to match the config of the queue which is durable when manually set up
  # But this does not work with this permission set as it tries to define a queu
  #   consumer_queue = consumer_conn.create_channel.queue(QUEUE, durable: true)
  #   consumer_queue.subscribe do |delivery_info, properties, content|
  # instead we use a basic consume client which we will need to tell customers to use
  channel = consumer_conn.create_channel

  puts "Consuming channel #{QUEUE}..."

  # arguments queue name, customer consumer tag if wanted, no_ack (false requires manual ACK)
  raise "Queue #{QUEUE} does not exist" unless consumer_conn.queue_exists?(QUEUE)
  channel.basic_consume(QUEUE, nil, false) do |delivery_info, properties, payload|
    puts " [x] consumed message: #{payload}, delivery tag: #{delivery_info.delivery_tag.to_i}"
    if rand(10) < 5
      channel.basic_ack(delivery_info.delivery_tag, false)
    else
      puts " [ ] Nacking #{payload}. Will be re-enqueued"
      channel.basic_nack(delivery_info.delivery_tag, false, true)
    end
  end

  while true
    sleep 1
  end
end